本类实现了treeview的插入子树，删除子树，子树升级、降级，子树上移下移等功能。 希望能够对大家有点帮助-achieve this kind of a treeview inserted subtrees, delete subtrees, subtrees upgrading, demotion tree-shift downward movement capabilities. We hope to be able to help a bit

经过改进后的TREE控件，可支持多选。正在继续优化，改进为同时也支持移动的TR-TREE control through improved to support multiple selections. Is continuing to optimize and improve the movement of TREE also supports